raw_ip.c revision 21673
1/* 2 * Copyright (c) 1982, 1986, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 34 * $FreeBSD: head/sys/netinet/raw_ip.c 21673 1997-01-14 07:20:47Z jkh $ 35 */ 36 37#include <sys/param.h> 38#include <sys/queue.h> 39#include <sys/malloc.h> 40#include <sys/mbuf.h> 41#include <sys/socket.h> 42#include <sys/protosw.h> 43#include <sys/socketvar.h> 44#include <sys/errno.h> 45#include <sys/systm.h> 46 47#include <net/if.h> 48#include <net/route.h> 49 50#define _IP_VHL 51#include <netinet/in.h> 52#include <netinet/in_systm.h> 53#include <netinet/ip.h> 54#include <netinet/in_pcb.h> 55#include <netinet/in_var.h> 56#include <netinet/ip_var.h> 57#include <netinet/ip_mroute.h> 58 59#include <netinet/ip_fw.h> 60 61#if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 62#undef COMPAT_IPFW 63#define COMPAT_IPFW 1 64#else 65#undef COMPAT_IPFW 66#endif 67 68static struct inpcbhead ripcb; 69static struct inpcbinfo ripcbinfo; 70 71/* 72 * Nominal space allocated to a raw ip socket. 73 */ 74#define RIPSNDQ 8192 75#define RIPRCVQ 8192 76 77/* 78 * Raw interface to IP protocol. 79 */ 80 81/* 82 * Initialize raw connection block q. 83 */ 84void 85rip_init() 86{ 87 LIST_INIT(&ripcb); 88 ripcbinfo.listhead = &ripcb; 89 /* 90 * XXX We don't use the hash list for raw IP, but it's easier 91 * to allocate a one entry hash list than it is to check all 92 * over the place for hashbase == NULL. 93 */ 94 ripcbinfo.hashbase = phashinit(1, M_PCB, &ripcbinfo.hashsize); 95} 96 97static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; 98/* 99 * Setup generic address and protocol structures 100 * for raw_input routine, then pass them along with 101 * mbuf chain. 102 */ 103void 104rip_input(m, iphlen) 105 struct mbuf *m; 106 int iphlen; 107{ 108 register struct ip *ip = mtod(m, struct ip *); 109 register struct inpcb *inp; 110 struct inpcb *last = 0; 111 struct mbuf *opts = 0; 112 113 ripsrc.sin_addr = ip->ip_src; 114 for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) { 115 if (inp->inp_ip.ip_p && inp->inp_ip.ip_p != ip->ip_p) 116 continue; 117 if (inp->inp_laddr.s_addr && 118 inp->inp_laddr.s_addr != ip->ip_dst.s_addr) 119 continue; 120 if (inp->inp_faddr.s_addr && 121 inp->inp_faddr.s_addr != ip->ip_src.s_addr) 122 continue; 123 if (last) { 124 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); 125 if (n) { 126 if (last->inp_flags & INP_CONTROLOPTS || 127 last->inp_socket->so_options & SO_TIMESTAMP) 128 ip_savecontrol(last, &opts, ip, n); 129 if (sbappendaddr(&last->inp_socket->so_rcv, 130 (struct sockaddr *)&ripsrc, n, 131 opts) == 0) { 132 /* should notify about lost packet */ 133 m_freem(n); 134 if (opts) 135 m_freem(opts); 136 } else 137 sorwakeup(last->inp_socket); 138 opts = 0; 139 } 140 } 141 last = inp; 142 } 143 if (last) { 144 if (last->inp_flags & INP_CONTROLOPTS || 145 last->inp_socket->so_options & SO_TIMESTAMP) 146 ip_savecontrol(last, &opts, ip, m); 147 if (sbappendaddr(&last->inp_socket->so_rcv, 148 (struct sockaddr *)&ripsrc, m, opts) == 0) { 149 m_freem(m); 150 if (opts) 151 m_freem(opts); 152 } else 153 sorwakeup(last->inp_socket); 154 } else { 155 m_freem(m); 156 ipstat.ips_noproto++; 157 ipstat.ips_delivered--; 158 } 159} 160 161/* 162 * Generate IP header and pass packet to ip_output. 163 * Tack on options user may have setup with control call. 164 */ 165int 166rip_output(m, so, dst) 167 register struct mbuf *m; 168 struct socket *so; 169 u_long dst; 170{ 171 register struct ip *ip; 172 register struct inpcb *inp = sotoinpcb(so); 173 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST; 174 175 /* 176 * If the user handed us a complete IP packet, use it. 177 * Otherwise, allocate an mbuf for a header and fill it in. 178 */ 179 if ((inp->inp_flags & INP_HDRINCL) == 0) { 180 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) { 181 m_freem(m); 182 return(EMSGSIZE); 183 } 184 M_PREPEND(m, sizeof(struct ip), M_WAIT); 185 ip = mtod(m, struct ip *); 186 ip->ip_tos = 0; 187 ip->ip_off = 0; 188 ip->ip_p = inp->inp_ip.ip_p; 189 ip->ip_len = m->m_pkthdr.len; 190 ip->ip_src = inp->inp_laddr; 191 ip->ip_dst.s_addr = dst; 192 ip->ip_ttl = MAXTTL; 193 } else { 194 if (m->m_pkthdr.len > IP_MAXPACKET) { 195 m_freem(m); 196 return(EMSGSIZE); 197 } 198 ip = mtod(m, struct ip *); 199 /* don't allow both user specified and setsockopt options, 200 and don't allow packet length sizes that will crash */ 201 if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2)) 202 && inp->inp_options) 203 || (ip->ip_len > m->m_pkthdr.len)) { 204 m_freem(m); 205 return EINVAL; 206 } 207 if (ip->ip_id == 0) 208 ip->ip_id = htons(ip_id++); 209 /* XXX prevent ip_output from overwriting header fields */ 210 flags |= IP_RAWOUTPUT; 211 ipstat.ips_rawout++; 212 } 213 return (ip_output(m, inp->inp_options, &inp->inp_route, flags, 214 inp->inp_moptions)); 215} 216 217/* 218 * Raw IP socket option processing. 219 */ 220int 221rip_ctloutput(op, so, level, optname, m) 222 int op; 223 struct socket *so; 224 int level, optname; 225 struct mbuf **m; 226{ 227 register struct inpcb *inp = sotoinpcb(so); 228 register int error; 229 230 if (level != IPPROTO_IP) { 231 if (op == PRCO_SETOPT && *m) 232 (void)m_free(*m); 233 return (EINVAL); 234 } 235 236 switch (optname) { 237 238 case IP_HDRINCL: 239 error = 0; 240 if (op == PRCO_SETOPT) { 241 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) 242 error = EINVAL; 243 else if (*mtod(*m, int *)) 244 inp->inp_flags |= INP_HDRINCL; 245 else 246 inp->inp_flags &= ~INP_HDRINCL; 247 if (*m) 248 (void)m_free(*m); 249 } else { 250 *m = m_get(M_WAIT, MT_SOOPTS); 251 (*m)->m_len = sizeof (int); 252 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; 253 } 254 return (error); 255 256#ifdef COMPAT_IPFW 257 case IP_FW_GET: 258 if (ip_fw_ctl_ptr == NULL || op == PRCO_SETOPT) { 259 if (*m) (void)m_free(*m); 260 return(EINVAL); 261 } 262 return (*ip_fw_ctl_ptr)(optname, m); 263 264 case IP_FW_ADD: 265 case IP_FW_DEL: 266 case IP_FW_FLUSH: 267 case IP_FW_ZERO: 268 if (ip_fw_ctl_ptr == NULL || op != PRCO_SETOPT) { 269 if (*m) (void)m_free(*m); 270 return(EINVAL); 271 } 272 return (*ip_fw_ctl_ptr)(optname, m); 273 274 case IP_NAT: 275 if (ip_nat_ctl_ptr == NULL) { 276 if (*m) (void)m_free(*m); 277 return(EINVAL); 278 } 279 return (*ip_nat_ctl_ptr)(op, m); 280 281#endif 282 case IP_RSVP_ON: 283 return ip_rsvp_init(so); 284 break; 285 286 case IP_RSVP_OFF: 287 return ip_rsvp_done(); 288 break; 289 290 case IP_RSVP_VIF_ON: 291 return ip_rsvp_vif_init(so, *m); 292 293 case IP_RSVP_VIF_OFF: 294 return ip_rsvp_vif_done(so, *m); 295 296 case MRT_INIT: 297 case MRT_DONE: 298 case MRT_ADD_VIF: 299 case MRT_DEL_VIF: 300 case MRT_ADD_MFC: 301 case MRT_DEL_MFC: 302 case MRT_VERSION: 303 case MRT_ASSERT: 304 if (op == PRCO_SETOPT) { 305 error = ip_mrouter_set(optname, so, *m); 306 if (*m) 307 (void)m_free(*m); 308 } else if (op == PRCO_GETOPT) { 309 error = ip_mrouter_get(optname, so, m); 310 } else 311 error = EINVAL; 312 return (error); 313 } 314 return (ip_ctloutput(op, so, level, optname, m)); 315} 316 317static u_long rip_sendspace = RIPSNDQ; /* XXX sysctl ? */ 318static u_long rip_recvspace = RIPRCVQ; /* XXX sysctl ? */ 319 320/*ARGSUSED*/ 321int 322rip_usrreq(so, req, m, nam, control) 323 register struct socket *so; 324 int req; 325 struct mbuf *m, *nam, *control; 326{ 327 register int error = 0; 328 register struct inpcb *inp = sotoinpcb(so); 329 330 if (req == PRU_CONTROL) 331 return (in_control(so, (u_long)m, (caddr_t)nam, 332 (struct ifnet *)control)); 333 334 switch (req) { 335 336 case PRU_ATTACH: 337 if (inp) 338 panic("rip_attach"); 339 if ((so->so_state & SS_PRIV) == 0) { 340 error = EACCES; 341 break; 342 } 343 if ((error = soreserve(so, rip_sendspace, rip_recvspace)) || 344 (error = in_pcballoc(so, &ripcbinfo))) 345 break; 346 inp = (struct inpcb *)so->so_pcb; 347 inp->inp_ip.ip_p = (int)nam; 348 break; 349 350 case PRU_DISCONNECT: 351 if ((so->so_state & SS_ISCONNECTED) == 0) { 352 error = ENOTCONN; 353 break; 354 } 355 /* FALLTHROUGH */ 356 case PRU_ABORT: 357 soisdisconnected(so); 358 /* FALLTHROUGH */ 359 case PRU_DETACH: 360 if (inp == 0) 361 panic("rip_detach"); 362 if (so == ip_mrouter) 363 ip_mrouter_done(); 364 ip_rsvp_force_done(so); 365 if (so == ip_rsvpd) 366 ip_rsvp_done(); 367 in_pcbdetach(inp); 368 break; 369 370 case PRU_BIND: 371 { 372 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 373 374 if (nam->m_len != sizeof(*addr)) { 375 error = EINVAL; 376 break; 377 } 378 if (TAILQ_EMPTY(&ifnet) || 379 ((addr->sin_family != AF_INET) && 380 (addr->sin_family != AF_IMPLINK)) || 381 (addr->sin_addr.s_addr && 382 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { 383 error = EADDRNOTAVAIL; 384 break; 385 } 386 inp->inp_laddr = addr->sin_addr; 387 break; 388 } 389 case PRU_CONNECT: 390 { 391 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); 392 393 if (nam->m_len != sizeof(*addr)) { 394 error = EINVAL; 395 break; 396 } 397 if (TAILQ_EMPTY(&ifnet)) { 398 error = EADDRNOTAVAIL; 399 break; 400 } 401 if ((addr->sin_family != AF_INET) && 402 (addr->sin_family != AF_IMPLINK)) { 403 error = EAFNOSUPPORT; 404 break; 405 } 406 inp->inp_faddr = addr->sin_addr; 407 soisconnected(so); 408 break; 409 } 410 411 case PRU_CONNECT2: 412 error = EOPNOTSUPP; 413 break; 414 415 /* 416 * Mark the connection as being incapable of further input. 417 */ 418 case PRU_SHUTDOWN: 419 socantsendmore(so); 420 break; 421 422 /* 423 * Ship a packet out. The appropriate raw output 424 * routine handles any massaging necessary. 425 */ 426 case PRU_SEND: 427 { 428 register u_long dst; 429 430 if (so->so_state & SS_ISCONNECTED) { 431 if (nam) { 432 error = EISCONN; 433 break; 434 } 435 dst = inp->inp_faddr.s_addr; 436 } else { 437 if (nam == NULL) { 438 error = ENOTCONN; 439 break; 440 } 441 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; 442 } 443 error = rip_output(m, so, dst); 444 m = NULL; 445 break; 446 } 447 448 case PRU_SENSE: 449 /* 450 * stat: don't bother with a blocksize. 451 */ 452 return (0); 453 454 /* 455 * Not supported. 456 */ 457 case PRU_RCVOOB: 458 case PRU_RCVD: 459 case PRU_LISTEN: 460 case PRU_ACCEPT: 461 case PRU_SENDOOB: 462 error = EOPNOTSUPP; 463 break; 464 465 case PRU_SOCKADDR: 466 in_setsockaddr(inp, nam); 467 break; 468 469 case PRU_PEERADDR: 470 in_setpeeraddr(inp, nam); 471 break; 472 473 default: 474 panic("rip_usrreq"); 475 } 476 if (m != NULL) 477 m_freem(m); 478 return (error); 479} 480